It also passes St James's Park, Buckingham Palace, the Tower of London and London Bridge. Transport for London will shut roads in the area from 9.30am to 4.30pm. It warned drivers to avoid central London.

The free event, organised by the Mayor, Sky and British Cycling in partnership with TfL, aims to introduce Londoners to biking. Led rides will take place throughout the day. Bands will play in St James's Park, there will be a family area in The Mall and experts will be on hand to answer cyclists' questions.

Joining riders will be actress and model Kelly Brook, right, and Olympic champion Sir Chris Hoy. Brook said: "Cycling is a fun way to spend time with friends and keep in shape."

Mayor Boris Johnson, said: "London's fantastic Sky Ride helps people of all ages enjoy the capital's most iconic sights on two wheels."